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采用连续退火模拟机CCT-AY-Ⅱ对中锰Q&P钢(0.2C-5Mn-1.5Si中锰钢,锰含量4.92%)进行热处理实验,利用SEM、EBSD、拉伸试验以及X射线衍射法研究了不同退火温度对中锰Q&P钢的组织和力学性能、残留奥氏体含量的影响。结果表明,随退火温度的升高,抗拉强度逐渐升高,屈服强度逐渐降低,伸长率和强塑积先升高后降低,在660℃奥氏体化Q&P处理后力学性能最佳,抗拉强度为1040 MPa,断后伸长率为33.7%,强塑积达35.9 GPa·%;残留奥氏体体积分数随着退火温度的升高逐渐增多,最高达25%;试验钢对两相区奥氏体化温度非常敏感,稍高或稍低的退火温度都会导致强塑积的急剧下降,而在650~670℃之间退火时强塑积可达30.0 GPa·%以上。
The heat treatment experiments of CCT-AY-Ⅱ were carried out using continuous annealing simulator CCS-AY-Ⅱ. The SEM, EBSD, tensile test and X-ray diffraction Effect of Different Annealing Temperatures on Microstructure and Mechanical Properties and Retained Austenite Content of Medium Manganese Q & P Steel. The results show that with the increase of annealing temperature, the tensile strength gradually increases, the yield strength decreases gradually, and the elongation and the ductility increase first and then decrease. After the austenitizing Q & P treatment at 660 ℃, the mechanical properties are the best, The tensile strength was 1040 MPa, the elongation at break was 33.7% and the strong plastic content was 35.9 GPa ·%. The retained austenite volume fraction increased gradually with the increase of annealing temperature, up to 25% The austenitizing temperature of zone is very sensitive. The higher or lower annealing temperature leads to the sharp decrease of the ductility, while the stronger ductility can reach 30.0 GPa ·% when annealed at 650 ~ 670 ℃.